WONDER BRIDGE

Flying over Huajiang River, the world's highest and longest mountain span is an architectural marvel. Shan Juan and Yang Jun report from Anshun, Guizhou province

Bridges are among the most spectacular structures on Earth, as they support thousands of metric tons of steel and concrete in the air in a way that almost seems magical.

Stretching 1,420 meters, the main span of the Huajiang Grand Canyon Bridge towers 625 meters above the Beipan River in Guizhou province. When it opens soon, it will be the world's highest and longest span in mountainous terrain and will shorten travel time between the two sides from two hours to two minutes.